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April 1940 lunar eclipse
Penumbral lunar eclipse From Wikipedia, the free encyclopedia
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A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Monday, April 22, 1940,[1] with an umbral magnitude of −0.0945. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring about 2.7 days after perigee (on April 20, 1940, at 20:20 UTC), the Moon's apparent diameter was larger.[2]
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Visibility
The eclipse was completely visible over much of North America, South America, west Africa, and Antarctica, seen rising over northwestern North America and the central Pacific Ocean and setting over Africa, Europe, and the Middle East.[3]
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Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
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Eclipse season
This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight. The first and last eclipse in this sequence is separated by one synodic month.
Related eclipses
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Eclipses in 1940
- A penumbral lunar eclipse on March 23.
- An annular solar eclipse on April 7.
- A penumbral lunar eclipse on April 22.
- A total solar eclipse on October 1.
- A penumbral lunar eclipse on October 16.
Metonic
- Preceded by: Lunar eclipse of July 4, 1936
- Followed by: Lunar eclipse of February 9, 1944
Tzolkinex
- Preceded by: Lunar eclipse of March 12, 1933
- Followed by: Lunar eclipse of June 3, 1947
Half-Saros
- Preceded by: Solar eclipse of April 18, 1931
- Followed by: Solar eclipse of April 28, 1949
Tritos
- Preceded by: Lunar eclipse of May 23, 1929
- Followed by: Lunar eclipse of March 23, 1951
Lunar Saros 140
- Preceded by: Lunar eclipse of April 11, 1922
- Followed by: Lunar eclipse of May 3, 1958
Inex
- Preceded by: Lunar eclipse of May 13, 1911
- Followed by: Lunar eclipse of April 2, 1969
Triad
- Preceded by: Lunar eclipse of June 21, 1853
- Followed by: Lunar eclipse of February 20, 2027
Lunar eclipses of 1937–1940
This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]
The penumbral lunar eclipse on March 23, 1940 occurs in the next lunar year eclipse set.
Saros 140
This eclipse is a part of Saros series 140, repeating every 18 years, 11 days, and containing 77 events. The series started with a penumbral lunar eclipse on September 25, 1597. It contains partial eclipses from May 3, 1958 through July 17, 2084; total eclipses from July 30, 2102 through May 21, 2589; and a second set of partial eclipses from June 2, 2607 through August 7, 2715. The series ends at member 77 as a penumbral eclipse on January 6, 2968.
The longest duration of totality will be produced by member 38 at 98 minutes, 36 seconds on November 4, 2264. All eclipses in this series occur at the Moon’s ascending node of orbit.[6]
Eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
Tritos series
This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
Inex series
This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[8] This lunar eclipse is related to two partial solar eclipses of Solar Saros 147.
April 18, 1931 | April 28, 1949 |
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Notes
External links
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